Composite stone arrangement for pavements

ABSTRACT

A stone arrangement for pavements comprises at least one center stone and, surrounding it, a multiplicity of border stones, the said center stone and border stones being provided with irregularly shaped interlocking recesses and projections to form a mutual anchoring of the stones and to prevent tilting of the border stones when exposed to an overload.

Umted States Patent 11 1 1111 3,870,423

Peitz, Jr. Mar. 11, 1975 [54] COMMJSITE STONE ARRANGEMENT FOR 3,221,614 12/1965 Pertien 404/41 PAVEMENTS FOREIGN PATENTS OR APPLICATIONS [7'31 Invent: Rochusweg 479 59,170 0/1913 Austria 52/609 Paderbom, Germany 627,731 0/1936 Germany 6,415,356 6/1966 Netherlands.... [22] My 1973 70,841 0/1952 Netherlands 404/41 211 Appl. No: 379,951

Primary Examiner-Nile C. Byers, Jr. [30] Foreign A fi fi p i i Dam Attorney, Agent, or Firm-Michael S. Striker Mar. 9, 1973 Germany 7308973 ABSTRACT [52] HS. Cl. 404/41, 52/608 51 Int. (:1. E0lc 5/00 A stone arrangement for P P least 58 Fie|d of Search 4Q4/41 42 44 4 3 one center stone and, surrounding it, a multiplicity 0f 404/39 34 29; 52/ 0 575 09 59 10 border stones, the said center stone and border stones 611 being provided with irregularly shaped interlocking recesses and projections to form a mutual anchoring [56] References Cited of the stones and to prevent tilting of the border UNITED STATES PATENTS stones when exposed to an overload. 2,340,526 2/1944 Green 404/42 5 5 Claims, 3 Drawing Figures COMPOSITE STONE ARRANGEMENT FOR PAVEMENTS BACKGROUND OF THE INVENTION Pavements are known wherein the center stone forms the normal or standard stone and has a substantially rectangular center piece and two lateral extensions which project from the center piece at right angles. It is also known that these extensions have lateral edges which are at an angle other than 90 regarding the front face of the extensions. Accordingly, these extensions have a shorter and a longer lateral edge. The sum of these two edges plus the double width of the center piece in these cases equals the length of a normal stone.

In these prior art arrangements the border stones were provided with straight edges which form an angle in regard to the normal stone.

In case of a heavy load on the border stones the latter have a tendency to tip or become depressed since they are neither anchored as between themselves nor as against the center stone. In addition these border stones with their straight abutting edges have only small dimensions and are of limited .size relative to the size of the normal stones.

It is therefore an object of the present invention to provide for border stones which can carry a substantial load and can be used for composite pavements of smaller width.

SUMMARY OF THE INVENTION According to the present invention the border stones have a substantially rectangular piece which at the face towards the pavement is provided with a recess which corresponds to the outer outline of a normal stone or are provided with a projection which corresponds likewise to the outline of the corresponding part of the normal stone.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a composite pavement in plan view consisting of the border stones of the invention and a center or normal stone;

FIG. 2 shows a perspective view of a normal stone; and

FIG. 3 shows a plan view of a normal stone at a scale of 1:1.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The normal stone which forms the center piece of the pavement consists of a center piece 1 which has a substantially rectangular outline and two lateral extensions 2 and 3 which generally extend at a right angle to the center piece. The front edges 4 and 5 of'these extensions form an angle with the lateral edges 6 and 7 which is other than 90.

Referring now to FIG. 3 it will be seen that with the width of the central piece being equal to a and the length of the lateral extension also being equal to a while the length of the larger lateral edge of the extension is equal to b and the length of the shorter edge is equal to c the length of the normal stone is equal to 2a b c.

As appears from FIG. 1 the pavement has only one normal stone of the type known in the prior art. All other stones are border stones according to the invention.

The pavement has two types of corner stones 8a, 8b and 9a, 9b respectively which are diagonally opposite.

The corner stones are generally rectangular and have a recess 10 which is of generally triangular shape with a set-off tip formed on the corner stone indicated by the reference numeral 12. Fitted into the recess is a corresponding projection of the adjoining intermediate border stone. For instance border stone 13b fits into the recess with the lateral edges 11a and 11b of the projections which corresponds to the recess 10. Because of the protruding tip 12 a firm interlock is obtained between the corner stone 8a and the adjoining intermediate border stone 13b.

The corner stones 9a and 9b likewise have a projection 14a and 14b which abuts the lateral faces of the center piece 1 including the larger lateral edges 6 and 6a of the extensions 2 and 3. The edge of corner stone 9b for instance abuts the lateral edge of center stone 1 with its face 15. The projection 14b of the corner stone 9b includes a lateral extension 26 which again forms a notch into which a protruding tip 27 provided on the adjoining intermediate stone 13c fits. This intermediate stone 13c in turn is provided with a similar projection 20 which interlocks with the corresponding tip 28 of the next adjoining intermediate border stone 13d. This stone again has a protrusion which interlocks with the tip 12 of the corner stone 8b formed in the same manner as on corner stone 8a.

The lengthwise intermediate border stones 18a and 18b likewise have a generally rectangular center piece indicated as 24 in case of stone 18b and an extension 25. This projection 25 abuts the front face 4 of the lateral extension 2 of the center piece 1 and also the front face 29 of the intermediate stone 13 as well as the lateral face 30 of the projection .of the intermediate stone 13a.

There is thus obtained afirm interlock between the intermediate stones 18a and 18b and the corner stones 8a, 8b, 9a, 9b and the adjoining intermediate stones 13a, 13b, 13c and 1311, respectively.

'FIG. 1 also makes it clear that the total area of the individual border stones is larger than the area of a normal stone.

A modification of the embodiment shown in FIG. 1 would be an embodiment where the border stones would have an outline similar to that of the normal stones 1 and would be provided with a slanting edge, that is a bevel surface like, stone 1. Thus the impression could be obtained that even in the area of the border stones only normal stones are employed.

The term stone used in this specification and the claims is intended to embrace both natural stones and any kind of other material as normally used for pavements such as synthetic materials, wooden material,

etc.

Without further analysis, the foreggoing will so fully 1 reveal the gist of the present invention that others can 1. In a stone arrangement for composite pavements, a combination comprising at least one center stone having a substantially rectangular center piece, said center piece forming a pair of protrusions transversely spaced on opposite lateral sides of said center piece, and two lateral extensions disposed substantially at right angles to and at opposite sides of said center piece, each of said extensions having a front edge and a smaller and a larger lateral edge so that each lateral edge makes an oblique angle with the respective front edge, each of said extensions defining with said center piece a recess transversely spaced from said protrusions; and a plurality of neighboring border stones including first and second border stones which abut said center stone and one of which has a protrusion and a recess respectively extending into and receiving one of said recesses and one of said protrusions of said center stone, each of said border stones having a projection and a cutout, and the projection and cutout of each border stone respectively extending into and receiving the cutout and projection of the adjacent border stone, the area of each of said border stones exceeding the area of said center stone, whereby the border stones are interlocked with respect to each other and with respect to said center stone so that tipping of said border stones is prevented when exposed to unequal loading.

2. The composite stone arrangement of claim 1 wherein the sum of the lengths of said smaller and larger lateral edges plus the double length of said center piece is about equal'to the length of said center stone.

3. The composite stone arrangement of claim 1 said border stones including a pair of diagonally opposed corner stones, each having a recess for receiving a lateral extension of an adjoining stone including the major part of the front edge of such extension.

4. The composite stone arrangement of claim 1 which includes a pair of diagonally opposed corner stones provided with a projection extending up to the extreme edge of one of said lateral extensions of said center stone and including the smaller of said lateral edges of the extension.

5. The composite stone arrangement of claim 4 which includes border stones intermediate said corner stones and forming the outer edge of the system, the said border stones having extensions abutting the outer edge of the extensions providing on the center stone and including the smaller of said two lateral sides thereof and abutting the front side of the extensions of an adjoining stone. 

1. In a stone arrangement for composite pavements, a combination comprising at least one center stone having a substantially rectangular center piece, said center piece forming a pair of protrusions transversely spaced on opposite lateral sides of said center piece, and two lateral extensions disposed substantially at right angles to and at opposite sides of said center piece, each of said extensions having a front edge and a smaller and a larger lateral edge so that each lateral edge makes an oblique angle with the respective front edge, each of said extensions defining with said center piece a recess transversely Spaced from said protrusions; and a plurality of neighboring border stones including first and second border stones which abut said center stone and one of which has a protrusion and a recess respectively extending into and receiving one of said recesses and one of said protrusions of said center stone, each of said border stones having a projection and a cutout, and the projection and cutout of each border stone respectively extending into and receiving the cutout and projection of the adjacent border stone, the area of each of said border stones exceeding the area of said center stone, whereby the border stones are interlocked with respect to each other and with respect to said center stone so that tipping of said border stones is prevented when exposed to unequal loading.
 1. In a stone arrangement for composite pavements, a combination comprising at least one center stone having a substantially rectangular center piece, said center piece forming a pair of protrusions transversely spaced on opposite lateral sides of said center piece, and two lateral extensions disposed substantially at right angles to and at opposite sides of said center piece, each of said extensions having a front edge and a smaller and a larger lateral edge so that each lateral edge makes an oblique angle with the respective front edge, each of said extensions defining with said center piece a recess transversely Spaced from said protrusions; and a plurality of neighboring border stones including first and second border stones which abut said center stone and one of which has a protrusion and a recess respectively extending into and receiving one of said recesses and one of said protrusions of said center stone, each of said border stones having a projection and a cutout, and the projection and cutout of each border stone respectively extending into and receiving the cutout and projection of the adjacent border stone, the area of each of said border stones exceeding the area of said center stone, whereby the border stones are interlocked with respect to each other and with respect to said center stone so that tipping of said border stones is prevented when exposed to unequal loading.
 2. The composite stone arrangement of claim 1 wherein the sum of the lengths of said smaller and larger lateral edges plus the double length of said center piece is about equal to the length of said center stone.
 3. The composite stone arrangement of claim 1 said border stones including a pair of diagonally opposed corner stones, each having a recess for receiving a lateral extension of an adjoining stone including the major part of the front edge of such extension.
 4. The composite stone arrangement of claim 1 which includes a pair of diagonally opposed corner stones provided with a projection extending up to the extreme edge of one of said lateral extensions of said center stone and including the smaller of said lateral edges of the extension. 